Excavating-machine.



N. RNNEBERG.

EXCAVATING MACHINE. APPLIOATION FILED MM 24. 1909.

Patentd Aug. i6,

Mmmm@ N. EONN'EBERG.

Patented Aug. 16,191G.

' IBIIEETSSHEBT 3.'

N1 RNNEBERGZ Hummm momms- APPLIUATXUN FILED MAY Q4. 190%.

Mmmm?, ug'. M9 im@ www stance by meansofv afzgear 33 which meshes with a gear 34 on the driving shaft of the 'engine '15, the gear 34 beiiig provided withJ may be opa clutch 35, so that the drum erated when desired. By means ofthis arrangement the frame 22 ma be swung upv and down on the shaft 11, thereby controlling its vertical movement. The position of the yoke 26, 4with reference t0 thel frame, is such that it will su port a large portion of the weight of the ame and vits connected partsLtherebytaking the strain oil from the shaft 11. proper swinging movementof the frame, I prefer to provide an additional guide and ior this purpose have arranged a segmental guide member 36 on the truss 9, which consists of plates 37 and 38 which are arranged 'so as to leave a groove 39 therebetween into which groove fits an angular movable guide member 40 which is secured to the side of the `frame 22, the arrangement being such that, as the frame 22 is raised or lowered, the guide assists in preventing lateral movement of the frame.

u/lmong the important features of this invention are the -special plows or digging devices and the carrying buckets together with the particular arrangement of the same in connection with the chains. At desired intervals, along the chains 17, I provide crossbars 4l upon which are mounted scrapers or digging devices 42 and 43. The digging devices 42 are provided with shar laterallyr and outwardly projecting cutting lades 43, the ones on the front sidev of the frame being extended so that they willcut beyond the plane Aof thgc chain 16 in order to give a suflicientfclearance for this chain'; the ones on the opposite side may be arranged in a similar manner, but this is not as essential, as ordinarily the chain at the rear will pass down through the space already excavated. The central plows or diggers 43 are preferably provided with downwardly projecting blades or ribs 44, which will tend 'to hold the cuttin apparatus against lateral movement. T ese diggers or cutting devices preferably project a suiiicient distance beyond the chains so that they.A will do substantially all of the cutting, whereby the buckets will only need to carry up the material and perhaps trim oil any rojections left `bv the main diggers. 4The `uckets 45 are referabiy arranged withtheir bottoms 46 substantiall parallel with and projecting slightly beyond the outer edges of the chains 17, the arrangement being such that the point of connection will be as near as possible to the digging side in order to avoid lateral strains on said connections and on the-chains. The backs 47 of the buckets are preferably arranged at an angle of greater lthan ninety. degrees to the bottoms 46, so Viviwthatpthe material will be readily discharged In order to `further insure the.

when the buckets pass up over the sprocket wheels 16. The body of the bucket is r ferably iormed of a single piece of metai ihr instance sheet steel, with the tops of the sides curved as indicated in Fig. 5, the sides bein overla ped as shown at 48'in order to al ow for t e bending up of the back portion'47. The front lower'edge of the bucket is preferably reinforced with a cutting edge 49 of suitable material vto stiii'en the edge and also to withstand the wear at this point.

The operation ofniv improved digging ap aratus will be readil understood by one ski led in the art, from the above description and the accompanying drawings. When the ditch is to be started, the frame 22 is graduallylowered from its elevated position until the lower reaches of the chains bring the diggin devices into contact with the groun The dirt will then be loosened by the digging devices 42 and 43 and will be gathered into the buckets 45 and carried up until the buckets ass over the sprocket Wheels 16 when the uckets will be inverted and the material discharged, making the spoil pile at a'distance from the sides el the ditch. When the frame has lbeen lowered a suiiicient distance until the desired depth has been reached, it will again be raised by means of the chain or cable until the digging devices clear the ound, when the truck 8 .is moved forwar substantially the Width of the excavating devices, when the frame 22 is again lowered and the operation repeated, this being continued until the ditch is completed.

lt is obvious that various changes in thc details of construction or arrangement of parts of' my .improved apparatus may be made without departing from the spirit of this invention, and therefore l do not Wish to be limited to the exact arrangement shown and described; but

What I claim and desire to secure by Letters Patent, is:

'1. In a machine for digging ditches, the combination of a truck, a shaft sup orted at the rear end of said truck, means ihr turning said shaft, a substantially triangular frame pivotally mounted at one of its apexes on said shaft, driving sprockets secured to said shaft, guide sprockets arranged at the other apexes of said frame, chains around said driving and guide sprockets, excavating and elevatin f devices carried by said chains said frame h the line of progression of said truck and one ot' the apexes of said frame being directed downwardly so that the lower reaches of the chains will conform substantially to the shape o f the ditch to be excavated,

y means for raising and lowering the free end of saifl frame, and a uide for guiding said fram in its up and Own movements.

2. In an excavating apparatus, the combieing arranged transversely oli' M mom-bl@ truck@ truss mmmtd im md truck at zhefrear end @n @hmm mmmbed at one @1nd of'said m ws ifm" mnng mid. Sfmft, spoclmt im. @aid shaft, uhmm cmyng amm/'a- :uw' elevating dmfces, passing over said m wfwes .m frame pif/@tally mnuntd wid @mit i' avifalg *the lower part 0f its md. am Spaulding 4im. {shape with Tin/iwi of Mm ditch to be excavated, ld@ .VUQS on smidv frame t0 glxde the una L11@ Same, a guidewwy malnut-` #311 mid mus, :L guide 011 said pivotd iframe. engaging "with maid guidaway, :l gmk@ comulct'ed with Sad llrzmm, und mmm :011- neted with said yoke fm raising and www ing th@ he@ Bud 03E smid iframe, *che anfang@ ment bing such that the material @mm/Med.

Afrom ish@ ditch will be @miriadi by said chains and elevating devices and discharged at a pomt ma sme dlstmm. from the sud@ of sac ditch A NATHL RUNNEBERG. Witrlesses:

M. @ma JUHN, A. W. FENBWMMLER 

